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41 lines
1.6 KiB
41 lines
1.6 KiB
from typing import Callable
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from urllib.parse import parse_qs
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from .exposition import _bake_output
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from .registry import CollectorRegistry, REGISTRY
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def make_asgi_app(registry: CollectorRegistry = REGISTRY, disable_compression: bool = False) -> Callable:
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"""Create a ASGI app which serves the metrics from a registry."""
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async def prometheus_app(scope, receive, send):
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assert scope.get("type") == "http"
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# Prepare parameters
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params = parse_qs(scope.get('query_string', b''))
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accept_header = "Accept: " + ",".join([
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value.decode("utf8") for (name, value) in scope.get('headers')
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if name.decode("utf8").lower() == 'accept'
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])
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accept_encoding_header = ",".join([
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value.decode("utf8") for (name, value) in scope.get('headers')
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if name.decode("utf8").lower() == 'accept-encoding'
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])
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# Bake output
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status, headers, output = _bake_output(registry, accept_header, accept_encoding_header, params, disable_compression)
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formatted_headers = []
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for header in headers:
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formatted_headers.append(tuple(x.encode('utf8') for x in header))
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# Return output
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payload = await receive()
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if payload.get("type") == "http.request":
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await send(
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{
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"type": "http.response.start",
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"status": int(status.split(' ')[0]),
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"headers": formatted_headers,
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}
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)
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await send({"type": "http.response.body", "body": output})
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return prometheus_app
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